mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-05-20 10:20:00 +02:00
50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package sequence
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import (
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"fmt"
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"hash/fnv"
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"github.com/bwmarrin/snowflake"
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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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// a simple snowflake Sequencer
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type SnowflakeSequencer struct {
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node *snowflake.Node
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}
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func NewSnowflakeSequencer(nodeid string, snowflakeId int) (*SnowflakeSequencer, error) {
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nodeid_hash := hash(nodeid) & 0x3ff
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if snowflakeId != 0 {
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nodeid_hash = uint32(snowflakeId)
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}
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glog.V(0).Infof("use snowflake seq id generator, nodeid:%s hex_of_nodeid: %x", nodeid, nodeid_hash)
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node, err := snowflake.NewNode(int64(nodeid_hash))
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if err != nil {
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fmt.Println(err)
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return nil, err
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}
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sequencer := &SnowflakeSequencer{node: node}
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return sequencer, nil
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}
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func hash(s string) uint32 {
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h := fnv.New32a()
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h.Write([]byte(s))
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return h.Sum32()
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}
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func (m *SnowflakeSequencer) NextFileId(count uint64) uint64 {
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return uint64(m.node.Generate().Int64())
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}
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// ignore setmax as we are snowflake
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func (m *SnowflakeSequencer) SetMax(seenValue uint64) {
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}
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// return a new id as no Peek is stored
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func (m *SnowflakeSequencer) Peek() uint64 {
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return uint64(m.node.Generate().Int64())
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}
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